diff --git a/newsfragment/3485.feature b/newsfragment/3485.feature
new file mode 100644
index 0000000000..68c78267be
--- /dev/null
+++ b/newsfragment/3485.feature
@@ -0,0 +1 @@
+Add beta warning to private space creation flow
\ No newline at end of file
diff --git a/vector/src/main/java/im/vector/app/features/spaces/SpaceCreationActivity.kt b/vector/src/main/java/im/vector/app/features/spaces/SpaceCreationActivity.kt
index 57c6b40404..6bf31dd5ce 100644
--- a/vector/src/main/java/im/vector/app/features/spaces/SpaceCreationActivity.kt
+++ b/vector/src/main/java/im/vector/app/features/spaces/SpaceCreationActivity.kt
@@ -53,16 +53,15 @@ class SpaceCreationActivity : SimpleFragmentActivity(), CreateSpaceViewModel.Fac
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-
         if (isFirstCreation()) {
             when (withState(viewModel) { it.step }) {
-                CreateSpaceState.Step.ChooseType -> {
+                CreateSpaceState.Step.ChooseType        -> {
                     navigateToFragment(ChooseSpaceTypeFragment::class.java)
                 }
-                CreateSpaceState.Step.SetDetails -> {
+                CreateSpaceState.Step.SetDetails        -> {
                     navigateToFragment(ChooseSpaceTypeFragment::class.java)
                 }
-                CreateSpaceState.Step.AddRooms -> {
+                CreateSpaceState.Step.AddRooms          -> {
                     navigateToFragment(CreateSpaceDefaultRoomsFragment::class.java)
                 }
                 CreateSpaceState.Step.ChoosePrivateType -> {
@@ -81,29 +80,29 @@ class SpaceCreationActivity : SimpleFragmentActivity(), CreateSpaceViewModel.Fac
 
         viewModel.observeViewEvents {
             when (it) {
-                CreateSpaceEvents.NavigateToDetails -> {
+                CreateSpaceEvents.NavigateToDetails           -> {
                     navigateToFragment(CreateSpaceDetailsFragment::class.java)
                 }
-                CreateSpaceEvents.NavigateToChooseType -> {
+                CreateSpaceEvents.NavigateToChooseType        -> {
                     navigateToFragment(ChooseSpaceTypeFragment::class.java)
                 }
-                CreateSpaceEvents.Dismiss -> {
+                CreateSpaceEvents.Dismiss                     -> {
                     finish()
                 }
-                CreateSpaceEvents.NavigateToAddRooms -> {
+                CreateSpaceEvents.NavigateToAddRooms          -> {
                     navigateToFragment(CreateSpaceDefaultRoomsFragment::class.java)
                 }
                 CreateSpaceEvents.NavigateToChoosePrivateType -> {
                     navigateToFragment(ChoosePrivateSpaceTypeFragment::class.java)
                 }
-                is CreateSpaceEvents.ShowModalError -> {
+                is CreateSpaceEvents.ShowModalError           -> {
                     hideWaitingView()
                     MaterialAlertDialogBuilder(this)
                             .setMessage(it.errorMessage)
                             .setPositiveButton(getString(R.string.ok), null)
                             .show()
                 }
-                is CreateSpaceEvents.FinishSuccess -> {
+                is CreateSpaceEvents.FinishSuccess            -> {
                     setResult(RESULT_OK, Intent().apply {
                         putExtra(RESULT_DATA_CREATED_SPACE_ID, it.spaceId)
                         putExtra(RESULT_DATA_DEFAULT_ROOM_ID, it.defaultRoomId)
@@ -111,7 +110,7 @@ class SpaceCreationActivity : SimpleFragmentActivity(), CreateSpaceViewModel.Fac
                     })
                     finish()
                 }
-                CreateSpaceEvents.HideModalLoading -> {
+                CreateSpaceEvents.HideModalLoading            -> {
                     hideWaitingView()
                 }
             }
@@ -135,9 +134,9 @@ class SpaceCreationActivity : SimpleFragmentActivity(), CreateSpaceViewModel.Fac
 
     private fun renderState(state: CreateSpaceState) {
         val titleRes = when (state.step) {
-            CreateSpaceState.Step.ChooseType -> R.string.activity_create_space_title
+            CreateSpaceState.Step.ChooseType        -> R.string.activity_create_space_title
             CreateSpaceState.Step.SetDetails,
-            CreateSpaceState.Step.AddRooms -> {
+            CreateSpaceState.Step.AddRooms          -> {
                 if (state.spaceType == SpaceType.Public) R.string.your_public_space
                 else R.string.your_private_space
             }
diff --git a/vector/src/main/java/im/vector/app/features/spaces/create/BetaWarningBottomSheet.kt b/vector/src/main/java/im/vector/app/features/spaces/create/BetaWarningBottomSheet.kt
new file mode 100644
index 0000000000..fc3d98e6b8
--- /dev/null
+++ b/vector/src/main/java/im/vector/app/features/spaces/create/BetaWarningBottomSheet.kt
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2021 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.spaces.create
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.setFragmentResult
+import im.vector.app.core.platform.VectorBaseBottomSheetDialogFragment
+import im.vector.app.databinding.BottomSheetSpaceCreatePrivateWarningBinding
+
+class BetaWarningBottomSheet : VectorBaseBottomSheetDialogFragment<BottomSheetSpaceCreatePrivateWarningBinding>() {
+
+    override fun getBinding(inflater: LayoutInflater, container: ViewGroup?) =
+            BottomSheetSpaceCreatePrivateWarningBinding.inflate(inflater, container, false)
+
+    override val showExpanded = true
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        views.continueButton.debouncedClicks {
+            setFragmentResult(REQUEST_KEY, Bundle.EMPTY)
+            dismiss()
+        }
+    }
+
+    companion object {
+        const val REQUEST_KEY = "BetaWarningBottomSheet"
+    }
+}
diff --git a/vector/src/main/java/im/vector/app/features/spaces/create/ChoosePrivateSpaceTypeFragment.kt b/vector/src/main/java/im/vector/app/features/spaces/create/ChoosePrivateSpaceTypeFragment.kt
index 4f079551eb..4031b56c1d 100644
--- a/vector/src/main/java/im/vector/app/features/spaces/create/ChoosePrivateSpaceTypeFragment.kt
+++ b/vector/src/main/java/im/vector/app/features/spaces/create/ChoosePrivateSpaceTypeFragment.kt
@@ -20,6 +20,7 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.fragment.app.setFragmentResultListener
 import com.airbnb.mvrx.activityViewModel
 import im.vector.app.R
 import im.vector.app.core.epoxy.onClick
@@ -38,6 +39,13 @@ class ChoosePrivateSpaceTypeFragment @Inject constructor(
     override fun getBinding(inflater: LayoutInflater, container: ViewGroup?) =
             FragmentSpaceCreateChoosePrivateModelBinding.inflate(layoutInflater, container, false)
 
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setFragmentResultListener(BetaWarningBottomSheet.REQUEST_KEY) { _, _ ->
+            sharedViewModel.handle(CreateSpaceAction.SetSpaceTopology(SpaceTopology.MeAndTeammates))
+        }
+    }
+
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
@@ -46,7 +54,7 @@ class ChoosePrivateSpaceTypeFragment @Inject constructor(
         }
 
         views.teammatesButton.onClick {
-            sharedViewModel.handle(CreateSpaceAction.SetSpaceTopology(SpaceTopology.MeAndTeammates))
+            BetaWarningBottomSheet().show(parentFragmentManager, "warning")
         }
 
         sharedViewModel.subscribe { state ->
diff --git a/vector/src/main/java/im/vector/app/features/spaces/create/CreateSpaceViewModel.kt b/vector/src/main/java/im/vector/app/features/spaces/create/CreateSpaceViewModel.kt
index 9881232f4d..aff342cea7 100644
--- a/vector/src/main/java/im/vector/app/features/spaces/create/CreateSpaceViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/spaces/create/CreateSpaceViewModel.kt
@@ -70,7 +70,7 @@ class CreateSpaceViewModel @AssistedInject constructor(
 
     override fun handle(action: CreateSpaceAction) {
         when (action) {
-            is CreateSpaceAction.SetRoomType -> {
+            is CreateSpaceAction.SetRoomType            -> {
                 setState {
                     copy(
                             step = CreateSpaceState.Step.SetDetails,
@@ -79,7 +79,7 @@ class CreateSpaceViewModel @AssistedInject constructor(
                 }
                 _viewEvents.post(CreateSpaceEvents.NavigateToDetails)
             }
-            is CreateSpaceAction.NameChanged -> {
+            is CreateSpaceAction.NameChanged            -> {
                 setState {
                     copy(
                             nameInlineError = null,
@@ -87,20 +87,20 @@ class CreateSpaceViewModel @AssistedInject constructor(
                     )
                 }
             }
-            is CreateSpaceAction.TopicChanged -> {
+            is CreateSpaceAction.TopicChanged           -> {
                 setState {
                     copy(
                             topic = action.topic
                     )
                 }
             }
-            CreateSpaceAction.OnBackPressed -> {
+            CreateSpaceAction.OnBackPressed             -> {
                 handleBackNavigation()
             }
-            CreateSpaceAction.NextFromDetails -> {
+            CreateSpaceAction.NextFromDetails           -> {
                 handleNextFromDetails()
             }
-            CreateSpaceAction.NextFromDefaultRooms -> {
+            CreateSpaceAction.NextFromDefaultRooms      -> {
                 handleNextFromDefaultRooms()
             }
             is CreateSpaceAction.DefaultRoomNameChanged -> {
@@ -112,10 +112,10 @@ class CreateSpaceViewModel @AssistedInject constructor(
                     )
                 }
             }
-            is CreateSpaceAction.SetAvatar -> {
+            is CreateSpaceAction.SetAvatar              -> {
                 setState { copy(avatarUri = action.uri) }
             }
-            is CreateSpaceAction.SetSpaceTopology -> {
+            is CreateSpaceAction.SetSpaceTopology       -> {
                 handleSetTopology(action)
             }
         }.exhaustive
@@ -123,7 +123,7 @@ class CreateSpaceViewModel @AssistedInject constructor(
 
     private fun handleSetTopology(action: CreateSpaceAction.SetSpaceTopology) {
         when (action.topology) {
-            SpaceTopology.JustMe -> {
+            SpaceTopology.JustMe         -> {
                 setState {
                     copy(
                             spaceTopology = SpaceTopology.JustMe,
@@ -146,10 +146,10 @@ class CreateSpaceViewModel @AssistedInject constructor(
 
     private fun handleBackNavigation() = withState { state ->
         when (state.step) {
-            CreateSpaceState.Step.ChooseType -> {
+            CreateSpaceState.Step.ChooseType        -> {
                 _viewEvents.post(CreateSpaceEvents.Dismiss)
             }
-            CreateSpaceState.Step.SetDetails -> {
+            CreateSpaceState.Step.SetDetails        -> {
                 setState {
                     copy(
                             step = CreateSpaceState.Step.ChooseType,
@@ -159,7 +159,7 @@ class CreateSpaceViewModel @AssistedInject constructor(
                 }
                 _viewEvents.post(CreateSpaceEvents.NavigateToChooseType)
             }
-            CreateSpaceState.Step.AddRooms -> {
+            CreateSpaceState.Step.AddRooms          -> {
                 if (state.spaceType == SpaceType.Private && state.spaceTopology == SpaceTopology.MeAndTeammates) {
                     setState {
                         copy(
@@ -234,7 +234,7 @@ class CreateSpaceViewModel @AssistedInject constructor(
                         )
                 )
                 when (result) {
-                    is CreateSpaceTaskResult.Success -> {
+                    is CreateSpaceTaskResult.Success             -> {
                         setState {
                             copy(creationResult = Success(result.spaceId))
                         }
@@ -246,7 +246,7 @@ class CreateSpaceViewModel @AssistedInject constructor(
                                 )
                         )
                     }
-                    is CreateSpaceTaskResult.PartialSuccess -> {
+                    is CreateSpaceTaskResult.PartialSuccess      -> {
                         // XXX what can we do here?
                         setState {
                             copy(creationResult = Success(result.spaceId))
diff --git a/vector/src/main/res/layout/bottom_sheet_space_create_private_warning.xml b/vector/src/main/res/layout/bottom_sheet_space_create_private_warning.xml
new file mode 100644
index 0000000000..7292c7df55
--- /dev/null
+++ b/vector/src/main/res/layout/bottom_sheet_space_create_private_warning.xml
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?colorSurface"
+    android:orientation="vertical"
+    android:padding="16dp">
+
+    <ImageView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"
+        android:layout_marginTop="16dp"
+        android:layout_marginBottom="12dp"
+        android:importantForAccessibility="no"
+        android:src="@drawable/ic_beta_pill" />
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:layout_marginBottom="12dp"
+        android:gravity="center"
+        android:text="@string/teammate_spaces_arent_quite_ready"
+        android:textColor="?vctr_content_primary"
+        android:textSize="20sp"
+        android:textStyle="bold" />
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="20dp"
+        android:gravity="center"
+        android:text="@string/teammate_spaces_might_not_join"
+        android:textColor="?vctr_content_secondary"
+        android:textSize="16sp" />
+
+    <Button
+        android:id="@+id/continueButton"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="@dimen/layout_vertical_margin"
+        android:text="@string/continue_anyway"
+        android:textAllCaps="true" />
+
+</LinearLayout>
diff --git a/vector/src/main/res/values/strings.xml b/vector/src/main/res/values/strings.xml
index 80120b51bf..621ecb7aee 100644
--- a/vector/src/main/res/values/strings.xml
+++ b/vector/src/main/res/values/strings.xml
@@ -771,6 +771,7 @@
     <string name="yes">YES</string>
     <string name="no">NO</string>
     <string name="_continue">Continue</string>
+    <string name="continue_anyway">Continue Anyway</string>
 
     <!-- Actions -->
     <string name="remove">Remove</string>
@@ -3399,4 +3400,7 @@
     <string name="this_space_has_no_rooms_admin">Some rooms may be hidden because they’re private and you need an invite.</string>
 
     <string name="unnamed_room">Unnamed Room</string>
+
+    <string name="teammate_spaces_arent_quite_ready">"Teammate spaces aren’t quite ready but you can still give them a try"</string>
+    <string name="teammate_spaces_might_not_join">"At the moment people might not be able to join any private rooms you make.\n\nWe’ll be improving this as part of the beta, but just wanted to let you know."</string>
 </resources>